cor·po·sant /ˈkɔrpəˌsænt, ˌzænt/
  放電光球
  Cor·po·sant n.  St. Elmo's fire. See under Saint.
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  corposant
       n : an electrical discharge accompanied by ionization of
           surrounding atmosphere [syn: corona discharge, corona,
            St. Elmo's fire, Saint Elmo's fire, Saint Elmo's
           light, Saint Ulmo's fire, Saint Ulmo's light, electric
           glow]